Pci Memory Sparse-Space Address Generation - Region; Pci Address Mapping - Samsung AlphaPC 164UX Technical Reference Manual

The high-order ad<31:26> are obtained from either the hardware extension register
(HAE_MEM) or the 21164 address depending on sparse-space regions, as shown in
Table 1–7. See the Digital Semiconductor 21174 Core Logic Chip Technical Refer-
ence Manual for more information about the 21174 HAE_MEM CSR.
Table 1–7 PCI Address Mapping
21164
Address Region
80.0000.0000 1
to
83.FFFF.FFFF
84.0000.0000 2
to
84.FFFF.FFFF
85.0000.0000 3
to
85.FFFF.FFFF
Figure 1–9 shows the mapping for region 1.
Figure 1–9 PCI Memory Sparse-Space Address Generation – Region 1
21164 Address
39 38
1
21164
HAE_MEM CSR
31 29 28
31 29 28
PCI Address
<31> <30>
HAE_MEM HAE_MEM HAE_MEM
<31> <30>
HAE_MEM HAE_MEM HAE_MEM
<15> <14>
HAE_MEM HAE_MEM HAE_MEM
<7> <6>
35 34 33
SBZ 0 PCI QW Address
00
PCI Sparse Memory Space
ad
<29> <28> <27>
CPU<33> CPU<32>
<29>
HAE_MEM HAE_MEM
<13> <12> <11>
HAE_MEM HAE_MEM
<5> <4> <3>
08 07 06 05 04 03 02
int4_valid
4 3
03 02 01 00
0 0
System Address Space
<26>
CPU<31>
CPU<31>
HAE_MEM
<2>
00
Length in Bytes
Byte Offset
LJ04265A.AI4
A–21